coin collector(n = noun.person) numismatist, numismatologist - a collector and student of money (and coins in particular);
is a kind of aggregator, collector

bill collector, book collector, butterfly collector, coin, coin bank, coin blank, coin box, coin collecting, coin collection, coin machine, coin silver, coin slot, collector, collector of internal revenue, flip of a coin, garbage collector, pinwheel wind collector, refuse collector, rent collector, solar collector, stamp collector, tax collector, ticket collector, toll collector